package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 过滤器验证账号是否登录
 */
//@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器 通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取本次请求的uri
        String requestURI = request.getRequestURI();

        log.info("拦截到请求: {}", requestURI);

        //定义不需要处理的的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**"
        };
        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //如果不需要 直接放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        // 判断登录状态 如果已经登录 直接放行
        if (request.getSession().getAttribute("emp")!=null){
            log.info("用户已经登录,用户名为{}",request.getSession().getAttribute("employee"));
            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //未登录直接返回未登录的结果
        response.setContentType("application/json;charset=utf-8");
        response.getWriter().write(JSON.toJSONString(R.error("未登录")));
        return;
    }

    /**
     * 匹配路径 检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
